1#ifndef _NET_DST_OPS_H
2#define _NET_DST_OPS_H
3#include <linux/types.h>
4#include <linux/percpu_counter.h>
5#include <linux/cache.h>
6
7struct dst_entry;
8struct kmem_cachep;
9struct net_device;
10struct sk_buff;
11struct sock;
12struct net;
13
14struct dst_ops {
15	unsigned short		family;
16	unsigned int		gc_thresh;
17
18	int			(*gc)(struct dst_ops *ops);
19	struct dst_entry *	(*check)(struct dst_entry *, __u32 cookie);
20	unsigned int		(*default_advmss)(const struct dst_entry *);
21	unsigned int		(*mtu)(const struct dst_entry *);
22	u32 *			(*cow_metrics)(struct dst_entry *, unsigned long);
23	void			(*destroy)(struct dst_entry *);
24	void			(*ifdown)(struct dst_entry *,
25					  struct net_device *dev, int how);
26	struct dst_entry *	(*negative_advice)(struct dst_entry *);
27	void			(*link_failure)(struct sk_buff *);
28	void			(*update_pmtu)(struct dst_entry *dst, struct sock *sk,
29					       struct sk_buff *skb, u32 mtu);
30	void			(*redirect)(struct dst_entry *dst, struct sock *sk,
31					    struct sk_buff *skb);
32	int			(*local_out)(struct net *net, struct sock *sk, struct sk_buff *skb);
33	struct neighbour *	(*neigh_lookup)(const struct dst_entry *dst,
34						struct sk_buff *skb,
35						const void *daddr);
36
37	struct kmem_cache	*kmem_cachep;
38
39	struct percpu_counter	pcpuc_entries ____cacheline_aligned_in_smp;
40};
41
42static inline int dst_entries_get_fast(struct dst_ops *dst)
43{
44	return percpu_counter_read_positive(&dst->pcpuc_entries);
45}
46
47static inline int dst_entries_get_slow(struct dst_ops *dst)
48{
49	int res;
50
51	local_bh_disable();
52	res = percpu_counter_sum_positive(&dst->pcpuc_entries);
53	local_bh_enable();
54	return res;
55}
56
57static inline void dst_entries_add(struct dst_ops *dst, int val)
58{
59	local_bh_disable();
60	percpu_counter_add(&dst->pcpuc_entries, val);
61	local_bh_enable();
62}
63
64static inline int dst_entries_init(struct dst_ops *dst)
65{
66	return percpu_counter_init(&dst->pcpuc_entries, 0, GFP_KERNEL);
67}
68
69static inline void dst_entries_destroy(struct dst_ops *dst)
70{
71	percpu_counter_destroy(&dst->pcpuc_entries);
72}
73
74#endif
75